[MARMAM] New paper on tooth wear and dental pathology in Amazonian dolphins

Carolina Loch Silva lochcarolina at gmail.com
Sun Feb 25 15:17:04 PST 2024

Dear MARMAM subscribers,

My co-author and I are pleased to announce the following paper in the *Latin
American Journal of Aquatic Mammals*:

*Tooth wear and dental pathology in Amazon River dolphins (Inia
geoffrensis) and tucuxis (Sotalia fluviatilis)*

Carolina Loch and Miriam Marmontel



The investigation of tooth wear and pathology in freshwater dolphins can
increase our understanding of their life history, including interactions
with the environment and impacts of disease and morbidity. This paper
evaluated the occurrence, prevalence and discussed the putative etiology of
dental wear and pathology in freshwater dolphins - tucuxi (Sotalia
fluviatilis) and the Amazon River dolphin (Inia geoffrensis) - from the
central Amazon basin. Teeth of 29 Amazon River dolphins and 14 tucuxis were
visually inspected to identify wear facets and the presence of pathology.
Dental wear was observed in 55% (n = 16) of the Amazon River dolphin and
79% (n = 11) of the tucuxi specimens. For both species, superficial wear
restricted to the tooth crown was more frequent. Calculus deposits were
observed in both species, occurring in 14% of tucuxi (n = 2) and 41% of
Amazon River dolphin (n = 12) specimens. Caries-like lesions were observed
in a third of Amazon River dolphin specimens (n = 10), affecting 10% of the
teeth (n = 197). Gross caries was the most commonly caries type observed.
Only one tucuxi had caries-like lesions, affecting 1.6% of the teeth (n =
13). While conditions such as tooth wear arise from normal physiological
processes, severe wear and pathology such as caries and calculus can
contribute to further disease development and morbidity, impacting the
health of the animals. Further studies using materials from museum
collections in other regions from the Amazon Basin will help elucidate the
occurrence, etiology, and health impact of tooth wear and dental pathology
in freshwater cetaceans, contributing to our growing understanding of their
life history.

Keywords: abrasion, calculus, caries, dental wear, pigmentation, river

Full text is available at:

Or alternatively, a *pdf* can be requested at: carolina.loch at otago.ac.nz

 Best regards,

*Carolina Loch Silva (She/her)*

Senior Lecturer in Oral Biology

Deputy Director, Sir John Walsh Research Institute

Faculty of Dentistry, University of Otago

 *Phone* +(64) 03 479-9255


*Email* carolina.loch at otago.ac.nz
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